/*
 * Copyright (c) 2009-2011, okazoh_tk. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  - Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "alkes/media/HeapImageBuffer.h"
#include "alkes/core/Memory.h"

namespace alkes {

HeapImageBuffer* HeapImageBuffer::create(uint16_t image_width, uint16_t image_height, PixelFormat format, bool write_only)
{
    int32_t pitch = alkes_get_bytelength(format, image_width);

    ImageBufferCaps caps;
    caps.image_width = image_width;
    caps.image_height = image_height;
    caps.buf_width = image_width;
    caps.buf_height = image_height;
    caps.format = format;

    return create(caps, pitch, write_only);
}

HeapImageBuffer* HeapImageBuffer::create(const ImageBufferCaps& caps, int32_t pitch, bool write_only)
{
    if (!validate(caps, pitch))
        return 0;

    HeapImageBuffer* ptr = new HeapImageBuffer(caps, pitch, write_only);

    if (ptr)
    {
        if (!ptr->createBuffer())
        {
            delete ptr;
            ptr = 0;
        }
    }

    return ptr;
}

HeapImageBuffer* HeapImageBuffer::createEmptyBuffer(const MemoryImageBuffer& src, bool write_only)
{
    return create(src.getCaps(), src.getPitch(), write_only);
}

void HeapImageBuffer::destroy()
{
    delete this;
}

HeapImageBuffer::HeapImageBuffer(const ImageBufferCaps& caps, int32_t pitch, bool write_only)
: MemoryImageBuffer(caps, pitch, write_only)
, buffer_(0)
{
}

HeapImageBuffer::~HeapImageBuffer()
{
    if (buffer_)
    {
        alkes_free(buffer_);
    }
}

bool HeapImageBuffer::createBuffer()
{
    uint16_t w, h;

    getSize(w, h);

    buffer_ = alkes_malloc(getPitch() * h);

    return 0 != buffer_;
}

void* HeapImageBuffer::onLockRect(const Rect& rect, uint32_t /*lock_mode*/, int32_t* pitch)
{
    PixelFormat format = getPixelFormat();

    void* locked = (uint8_t*)buffer_ + rect.y * getPitch() + alkes_get_bytelength(format, rect.x);

    if (locked && pitch)
        *pitch = getPitch();

    return locked;
}

void HeapImageBuffer::onUnlockRect(const Rect& /*locked_rect*/)
{
}

const void* HeapImageBuffer::getBufferPtr() const
{
    return buffer_;
}

}
